BIOLOGY AND CONTROL OF THE SAWFLY,ARGE PAGANA PANZER

This paper reports the results of a study on the biology and chemical control of the rose sawfly,Arge pagana Panzer in 1982-1983.It is one of the most important pests of the rose. It was observed that in the field generations overlap. In the insectary ,there were one to nine generations each year in Guangzhou, Guangdong Province. Winter was passed as mature larvae within cocoons in the soil. The eggs were laid individually in two longitudinal rows, being inserted into a tender stem by means of the female' s strong saw-like ovipositor. The eggs hatched after 6. 0-12. 0 days. The larvae fed on the tender leaves and cause injury to the field-grown rose. When mature, the larvae descended to the ground and spun their cocoons in the soil. Reproduction is bisexual or parthenogenetic. The larva had five to six instars.and larval development lasted 8. 5-18. 0 days. For the pupa it was 8. 0- I 3. 5 days. The adults lived for 1. 5 - 9. 5 days.Laboratory studies showed that spraying with Dipterex, Dichlorphos, Phoxim, Malathion, Pyridaphention, Cymbush.Dimcthoate or Omethoate was very effective in the control of 2nd -4th instar larvae.